<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <table>
    <tr>
      <th>header1</th>
      <th>header2</th>
      <th>header3</th>
      <th>header4</th>
    </tr>
    <tr>
      <td>
        <select>
          <option>Option 1</option>
          <option>Option 2</option>
          <option>Option 3</option>
        </select>
      </td>
      <td>I'm your second cell.</td>
      <td>I'm your third cell.</td>
      <td>I'm your fourth cell.</td>
    </tr>
    <tr>
      <td>Second row, first cell.</td>
      <td>Cell 2.</td>
      <td>Cell 3.</td>
      <td>Cell 4.</td>
    </tr>
  </table>
</body>
</html>